TV gold! Neil Patrick Harris reveals photos of twins Harper and Gideon dressed up as leprechauns on David Letterman

The How I Met Your Mother star showed off the snaps of son Gideon and daughter Harper in the festive costumes during an appearance on the Late Show with David Letterman.

Harris admitted he and partner David Burtka cannot help dressing up the youngsters in costumes for each holiday.

Cheeky: Neil Patrick Harris opened up his family photo album, showing cute photos of twins Gideon and Harper on the Late Show with David Letterman

Doting daddy: The How I Met Your Mother star said he and partner David Brutka can't resist dressing up their son and daughter

The Doogie Howser M.D actor showed talk
show host Letterman the twins dressed up as leprechauns for St.
Patrick's Day, as bunnies for Easter and in Mexican outfits for Cinco de
Mayo.

Earlier he revealed some other heart-warming pictures during an appearance on day-time talkshow The View.

The eight-month olds lay on their backs holding hands as they gazed into the camera with their blue eyes.

Too cute: Here the brother and sister are seen dressed up in Mexican outfits in celebration of Cinco de
Mayo

Festive: The pair done rabbit ears, decked out in their Easter costumes complete with baskets

The pair were born by surrogate in October last year, to the 37-year-old and his partner, Burtka, 35.

The star told how he and Burtka were forced to keep the secret that they were having their babies before the birth.

And he revealed how the youngsters have had playdates with Elton Johnand David Furnish's son
Zachary.

Dapper: The sitcom star dressed up in a suit for his television appearance

The couple are in New York with their babies and have been making the most of exploring the city.

Burtka told New York magazine that the children were enjoying their new surroundings.

'They’re
enjoying New York; they’re able to wander more here than in LA. This is
more of a walking town, so we’ve strapped on the Baby Björns plenty of
times, and they like to see all that there is to see here.'

Adorable: Earlier he showed pics of the pair on U.S. TV show The View

Proud father: Harris shows off his twins to the women of The View

Burtka, a chef and an actor, has been staying at home with the children.

'I've been taking care of a lot of babies, as you know, so I spend a lot of my days doing that.

'They are the most fantastic kids,'
he said. 'We have been blessed with two perfect little angels. Happy and
sleeping, and it's a godsend. We’re thrilled.'

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Neil Patrick Harris shows photos of twins as leprechauns on David Letterman